Did you ever forget to sign your tax return before sticking it in the mail? Oops. Maybe you put down the wrong Social Security number by mistake? How about claiming the wrong tax status -- like filing as a single person when you were married? That's another big no-no.
These are just a few of the mistakes people commonly make when filing their tax returns (see "10 tax goofs many of us keep making").
We know our readers have likely made many other, more-colorful tax faux pas. The dog ate my return, anyone?
In the spirit of helping your fellow MSN Money readers, please tell us about the biggest tax goof you ever made. Just leave your anecdote as a comment below, and include the city where you reside. We'll report on our readers' biggest tax blunders in an upcoming feature.